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Nuclear Theory·nucl-th

Thursday·December 3, 2015

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    [Submitted on 1 Dec 2015]

    Complex suppression patterns distinguish between major energy loss effects in Quark-Gluon Plasma

    Magdalena Djordjevic🇷🇸

    Interactions of high momentum partons with Quark-Gluon Plasma created in relativistic heavy-ion collisions provide an excellent tomography tool for this new form of matter. Recent measurements for charged hadrons and unidentified jets at the LHC show an unexpected flattening of the suppression curves at high momentum, exhibited when either momentum or the collision centrality is changed. Furthermore, a limited data available for B probes indicate a qualitatively different pattern, as nearly the same flattening is exhibited for the curves corresponding to two opposite momentum ranges. We here show that the experimentally measured suppression curves are well reproduced by our theoretical predictions, and that the complex suppression patterns are due to an interplay of collisional, radiative energy loss and the dead-cone effect. Furthermore, for B mesons, we predict that the uniform flattening of the suppression indicated by the limited dataset is in fact valid across the entire span of the momentum ranges, which will be tested by the upcoming experiments. Overall, the study presented here, provides a rare opportunity for pQCD theory to qualitatively distinguish between the major energy loss mechanisms at the same (nonintuitive) dataset.

    Comments:
    4 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1512.00505 [pdf]
    PLB(2016)·6 citations
  2. 02

    [Submitted on 2 Dec 2015]

    Antimatter H Hypernucleus Production and the H/He Puzzle in Relativistic Heavy-Ion Collisions

    Kai-Jia Sun🇨🇳 · Lie-Wen Chen🇨🇳

    We show that the measured yield ratio H/He (/) in Au+Au collisions at GeV and in Pb+Pb collisions at TeV can be understood within a covariant coalescence model if (anti-) particles freeze out earlier than (anti-)nucleons but their relative freezeout time is closer at TeV than at GeV. The earlier (anti-) freezeout can significantly enhance the yield of (anti)hypernucleus H (), leading to that has a comparable abundance with and thus provides an easily measured antimatter candidate heavier than . The future measurement on H () would be very useful to understand the (anti-) freezeout dynamics and the production mechanism of (anti)hypernuclei in relativistic heavy-ion collisions.

    Comments:
    7 pages, 4 figures, 2 tables. Significantly expanded to include some details and discussions. Accepted version to appear in PRC
    Subjects:
    Nuclear Theory (nucl-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1512.00692 [pdf]
    PRC(2016)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE